* {
    margin: 0px;
    padding: 0px;
    font-family: LiSu;
}

body{
    background-image: url("../images/backgroundimage.png");
}

a {
    text-decoration: none;
}

#overall {
    width: 100%;
    height: 100%;
}

#teacherLogin {
    width: 276px;
    height: 140px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.login_value {
    height: 30px;
    width: 200px;
    background: none;
    border-radius: 5px;
    border: none;
}

#teacherLogin table {
    text-align: center;
    border-radius: 5px;
    border: 5px gray solid;
}

#teacherLogin table td {
    border: 3px gray solid;
    height: 30px;
    line-height: 30px;
    text-align: center;
}

#teacherLogin table th {
    border: 3px gray solid;
    height: 30px;
    line-height: 30px;
    text-align: center;
}

#main {
    width: 60%;
    height: 550px;
    margin: 0px auto;
    border: 8px gray double;
}

#logo {
    width: 100%;
    height: 80px;
    line-height: 80px;
    border-bottom: 5px gray double;
    font-size: 30px;
    font-family: LiSu;
    box-sizing: border-box;
}

#logo p {
    margin-left: 50px;
    width: 350px;
}

#title {
    width: 100%;
    height: 70px;
    font-size: 30px;
    padding-top: 20px;
    padding-bottom: 10px;
    border-bottom: 5px gray double;
    box-sizing: border-box;
}

.stu {
    width: 232px;
    height: 150px;
    float: left;
    box-sizing: border-box;
    margin: 20px 10px 0px 10px;
}

.stu table {
    width: 100%;
    height: 100%;
    border: 1px gray solid;
    box-sizing: border-box;
    text-align: center;
}

.stu table td {
    border: 1px gray solid;
}

#studentsInfo {
    height: auto;
}

#isYueke {
    height: 150px;
    text-align: center;
    margin-top: 150px;
}

#isYueke div {
    border: 5px gray double;
    width: 150px;
    height: 150px;
    border-radius: 80px;
    text-align: center;
    line-height: 150px;
    font-size: 30px;
    box-sizing: border-box;
    float: left;
    margin-left: 80px;
}

#isYueke div:hover {
    border: 5px #ff0000 double;
}

.list_table{
    border: 1px double ghostwhite;
    text-align: center;
    position: absolute;
    left: 10%;
    top: 10%;
    font-size: 16px;
    box-sizing: border-box;
    color: #ac2925;
}
.list_table td{
    border: 1px double ghostwhite;
    width: 150px;
    height: 35px;
    line-height: 35px;
}
.list_table th{
    border: 1px double ghostwhite;
    height: 50px;
    line-height: 50px;
}
.list_table button{
    width: 80px;
    height: 30px;
    background: #33FF66;
    border: 1px ghostwhite solid;
    border-radius: 5px;
}

.list_table input{
    width: 150px;
    height: 45px;
    font-size: 18px;
    background: none;
    border: none;
}